blob: 048187814db6a8f33a50d027ededf0d7ba73c457 [file] [log] [blame]
// RUN: %clang_cc1 -std=c++98 %s -verify -fexceptions -fcxx-exceptions -pedantic-errors -Wno-bind-to-temporary-copy
// RUN: %clang_cc1 -std=c++11 %s -verify -fexceptions -fcxx-exceptions -pedantic-errors -triple %itanium_abi_triple
// RUN: %clang_cc1 -std=c++14 %s -verify -fexceptions -fcxx-exceptions -pedantic-errors -triple %itanium_abi_triple
// RUN: %clang_cc1 -std=c++17 %s -verify -fexceptions -fcxx-exceptions -pedantic-errors -triple %itanium_abi_triple
namespace dr1 { // dr1: no
namespace X { extern "C" void dr1_f(int a = 1); }
namespace Y { extern "C" void dr1_f(int a = 1); }
using X::dr1_f; using Y::dr1_f;
void g() {
dr1_f(0);
// FIXME: This should be rejected, due to the ambiguous default argument.
dr1_f();
}
namespace X {
using Y::dr1_f;
void h() {
dr1_f(0);
// FIXME: This should be rejected, due to the ambiguous default argument.
dr1_f();
}
}
namespace X {
void z(int);
}
void X::z(int = 1) {} // expected-note {{previous}}
namespace X {
void z(int = 1); // expected-error {{redefinition of default argument}}
}
void i(int = 1);
void j() {
void i(int = 1);
using dr1::i;
i(0);
// FIXME: This should be rejected, due to the ambiguous default argument.
i();
}
void k() {
using dr1::i;
void i(int = 1);
i(0);
// FIXME: This should be rejected, due to the ambiguous default argument.
i();
}
}
namespace dr3 { // dr3: yes
template<typename T> struct A {};
template<typename T> void f(T) { A<T> a; } // expected-note {{implicit instantiation}}
template void f(int);
template<> struct A<int> {}; // expected-error {{explicit specialization of 'dr3::A<int>' after instantiation}}
}
namespace dr4 { // dr4: yes
extern "C" {
static void dr4_f(int) {}
static void dr4_f(float) {}
void dr4_g(int) {} // expected-note {{previous}}
void dr4_g(float) {} // expected-error {{conflicting types}}
}
}
namespace dr5 { // dr5: yes
struct A {} a;
struct B {
B(const A&);
B(const B&);
};
const volatile B b = a;
struct C { C(C&); };
struct D : C {};
struct E { operator D&(); } e;
const C c = e;
}
namespace dr7 { // dr7: yes
class A { public: ~A(); };
class B : virtual private A {}; // expected-note 2 {{declared private here}}
class C : public B {} c; // expected-error 2 {{inherited virtual base class 'dr7::A' has private destructor}} \
// expected-note {{implicit default constructor for 'dr7::C' first required here}} \
// expected-note {{implicit destructor for 'dr7::C' first required here}}
class VeryDerivedC : public B, virtual public A {} vdc;
class X { ~X(); }; // expected-note {{here}}
class Y : X { ~Y() {} }; // expected-error {{private destructor}}
namespace PR16370 { // This regressed the first time DR7 was fixed.
struct S1 { virtual ~S1(); };
struct S2 : S1 {};
struct S3 : S2 {};
struct S4 : virtual S2 {};
struct S5 : S3, S4 {
S5();
~S5();
};
S5::S5() {}
}
}
namespace dr8 { // dr8: dup 45
class A {
struct U;
static const int k = 5;
void f();
template<typename, int, void (A::*)()> struct T;
T<U, k, &A::f> *g();
};
A::T<A::U, A::k, &A::f> *A::g() { return 0; }
}
namespace dr9 { // dr9: yes
struct B {
protected:
int m; // expected-note {{here}}
friend int R1();
};
struct N : protected B { // expected-note 2{{protected}}
friend int R2();
} n;
int R1() { return n.m; } // expected-error {{protected base class}} expected-error {{protected member}}
int R2() { return n.m; }
}
namespace dr10 { // dr10: dup 45
class A {
struct B {
A::B *p;
};
};
}
namespace dr11 { // dr11: yes
template<typename T> struct A : T {
using typename T::U;
U u;
};
template<typename T> struct B : T {
using T::V;
V v; // expected-error {{unknown type name}}
};
struct X { typedef int U; };
A<X> ax;
}
namespace dr12 { // dr12: sup 239
enum E { e };
E &f(E, E = e);
void g() {
int &f(int, E = e);
// Under DR12, these call two different functions.
// Under DR239, they call the same function.
int &b = f(e);
int &c = f(1);
}
}
namespace dr13 { // dr13: no
extern "C" void f(int);
void g(char);
template<typename T> struct A {
A(void (*fp)(T));
};
template<typename T> int h(void (T));
A<int> a1(f); // FIXME: We should reject this.
A<char> a2(g);
int a3 = h(f); // FIXME: We should reject this.
int a4 = h(g);
}
namespace dr14 { // dr14: yes
namespace X { extern "C" int dr14_f(); }
namespace Y { extern "C" int dr14_f(); }
using namespace X;
using namespace Y;
int k = dr14_f();
class C {
int k;
friend int Y::dr14_f();
} c;
namespace Z {
extern "C" int dr14_f() { return c.k; }
}
namespace X { typedef int T; typedef int U; } // expected-note {{candidate}}
namespace Y { typedef int T; typedef long U; } // expected-note {{candidate}}
T t; // ok, same type both times
U u; // expected-error {{ambiguous}}
}
namespace dr15 { // dr15: yes
template<typename T> void f(int); // expected-note {{previous}}
template<typename T> void f(int = 0); // expected-error {{default arguments cannot be added}}
}
namespace dr16 { // dr16: yes
class A { // expected-note {{here}}
void f(); // expected-note {{here}}
friend class C;
};
class B : A {}; // expected-note 4{{here}}
class C : B {
void g() {
f(); // expected-error {{private member}} expected-error {{private base}}
A::f(); // expected-error {{private member}} expected-error {{private base}}
}
};
}
namespace dr17 { // dr17: yes
class A {
int n;
int f();
struct C;
};
struct B : A {} b;
int A::f() { return b.n; }
struct A::C : A {
int g() { return n; }
};
}
// dr18: sup 577
namespace dr19 { // dr19: yes
struct A {
int n; // expected-note {{here}}
};
struct B : protected A { // expected-note {{here}}
};
struct C : B {} c;
struct D : B {
int get1() { return c.n; } // expected-error {{protected member}}
int get2() { return ((A&)c).n; } // ok, A is an accessible base of B from here
};
}
namespace dr20 { // dr20: yes
class X {
public:
X();
private:
X(const X&); // expected-note {{here}}
};
X &f();
X x = f(); // expected-error {{private}}
}
namespace dr21 { // dr21: yes
template<typename T> struct A;
struct X {
template<typename T = int> friend struct A; // expected-error {{default template argument not permitted on a friend template}}
template<typename T = int> friend struct B; // expected-error {{default template argument not permitted on a friend template}}
};
}
namespace dr22 { // dr22: sup 481
template<typename dr22_T = dr22_T> struct X; // expected-error {{unknown type name 'dr22_T'}}
typedef int T;
template<typename T = T> struct Y;
}
namespace dr23 { // dr23: yes
template<typename T> void f(T, T); // expected-note {{candidate}}
template<typename T> void f(T, int); // expected-note {{candidate}}
void g() { f(0, 0); } // expected-error {{ambiguous}}
}
// dr24: na
namespace dr25 { // dr25: yes
struct A {
void f() throw(int); // expected-error 0-1{{ISO C++17 does not allow}} expected-note 0-1{{use 'noexcept}}
};
void (A::*f)() throw (int); // expected-error 0-1{{ISO C++17 does not allow}} expected-note 0-1{{use 'noexcept}}
void (A::*g)() throw () = f;
#if __cplusplus <= 201402L
// expected-error@-2 {{is not superset of source}}
#else
// expected-error@-4 {{different exception specifications}}
#endif
void (A::*g2)() throw () = 0;
void (A::*h)() throw (int, char) = f; // expected-error 0-1{{ISO C++17 does not allow}} expected-note 0-1{{use 'noexcept}}
void (A::*i)() throw () = &A::f;
#if __cplusplus <= 201402L
// expected-error@-2 {{is not superset of source}}
#else
// expected-error@-4 {{different exception specifications}}
#endif
void (A::*i2)() throw () = 0;
void (A::*j)() throw (int, char) = &A::f; // expected-error 0-1{{ISO C++17 does not allow}} expected-note 0-1{{use 'noexcept}}
void x() {
g2 = f;
#if __cplusplus <= 201402L
// expected-error@-2 {{is not superset of source}}
#else
// expected-error@-4 {{different exception specifications}}
#endif
h = f;
i2 = &A::f;
#if __cplusplus <= 201402L
// expected-error@-2 {{is not superset of source}}
#else
// expected-error@-4 {{different exception specifications}}
#endif
j = &A::f;
}
}
namespace dr26 { // dr26: yes
struct A { A(A, const A & = A()); }; // expected-error {{must pass its first argument by reference}}
struct B {
B(); // expected-note 0-1{{candidate}}
B(const B &, B = B());
#if __cplusplus <= 201402L
// expected-error@-2 {{no matching constructor}} expected-note@-2 {{candidate}} expected-note@-2 {{here}}
#endif
};
struct C {
static C &f();
C(const C &, C = f()); // expected-error {{no matching constructor}} expected-note {{candidate}} expected-note {{here}}
};
}
namespace dr27 { // dr27: yes
enum E { e } n;
E &m = true ? n : n;
}
// dr28: na lib
namespace dr29 { // dr29: 3.4
void dr29_f0(); // expected-note {{here}}
void g0() { void dr29_f0(); }
extern "C++" void g0_cxx() { void dr29_f0(); }
extern "C" void g0_c() { void dr29_f0(); } // expected-error {{different language linkage}}
extern "C" void dr29_f1(); // expected-note {{here}}
void g1() { void dr29_f1(); }
extern "C" void g1_c() { void dr29_f1(); }
extern "C++" void g1_cxx() { void dr29_f1(); } // expected-error {{different language linkage}}
void g2() { void dr29_f2(); } // expected-note {{here}}
extern "C" void dr29_f2(); // expected-error {{different language linkage}}
extern "C" void g3() { void dr29_f3(); } // expected-note {{here}}
extern "C++" void dr29_f3(); // expected-error {{different language linkage}}
extern "C++" void g4() { void dr29_f4(); } // expected-note {{here}}
extern "C" void dr29_f4(); // expected-error {{different language linkage}}
extern "C" void g5();
extern "C++" void dr29_f5();
void g5() {
void dr29_f5(); // ok, g5 is extern "C" but we're not inside the linkage-specification here.
}
extern "C++" void g6();
extern "C" void dr29_f6();
void g6() {
void dr29_f6(); // ok, g6 is extern "C" but we're not inside the linkage-specification here.
}
extern "C" void g7();
extern "C++" void dr29_f7(); // expected-note {{here}}
extern "C" void g7() {
void dr29_f7(); // expected-error {{different language linkage}}
}
extern "C++" void g8();
extern "C" void dr29_f8(); // expected-note {{here}}
extern "C++" void g8() {
void dr29_f8(); // expected-error {{different language linkage}}
}
}
namespace dr30 { // dr30: sup 468 c++11
struct A {
template<int> static int f();
} a, *p = &a;
int x = A::template f<0>();
int y = a.template f<0>();
int z = p->template f<0>();
#if __cplusplus < 201103L
// FIXME: It's not clear whether DR468 applies to C++98 too.
// expected-error@-5 {{'template' keyword outside of a template}}
// expected-error@-5 {{'template' keyword outside of a template}}
// expected-error@-5 {{'template' keyword outside of a template}}
#endif
}
namespace dr31 { // dr31: yes
class X {
private:
void operator delete(void*); // expected-note {{here}}
};
// We would call X::operator delete if X() threw (even though it can't,
// and even though we allocated the X using ::operator delete).
X *p = new X; // expected-error {{private}}
}
// dr32: na
namespace dr33 { // dr33: yes
namespace X { struct S; void f(void (*)(S)); } // expected-note {{candidate}}
namespace Y { struct T; void f(void (*)(T)); } // expected-note {{candidate}}
void g(X::S);
template<typename Z> Z g(Y::T);
void h() { f(&g); } // expected-error {{ambiguous}}
}
// dr34: na
// dr35: dup 178
// dr37: sup 475
namespace dr38 { // dr38: yes
template<typename T> struct X {};
template<typename T> X<T> operator+(X<T> a, X<T> b) { return a; }
template X<int> operator+<int>(X<int>, X<int>);
}
namespace dr39 { // dr39: no
namespace example1 {
struct A { int &f(int); };
struct B : A {
using A::f;
float &f(float);
} b;
int &r = b.f(0);
}
namespace example2 {
struct A {
int &x(int); // expected-note {{found}}
static int &y(int); // expected-note {{found}}
};
struct V {
int &z(int);
};
struct B : A, virtual V {
using A::x; // expected-note {{found}}
float &x(float);
using A::y; // expected-note {{found}}
static float &y(float);
using V::z;
float &z(float);
};
struct C : A, B, virtual V {} c; // expected-warning {{direct base 'dr39::example2::A' is inaccessible due to ambiguity:\n struct dr39::example2::C -> struct dr39::example2::A\n struct dr39::example2::C -> struct dr39::example2::B -> struct dr39::example2::A}}
int &x = c.x(0); // expected-error {{found in multiple base classes}}
// FIXME: This is valid, because we find the same static data member either way.
int &y = c.y(0); // expected-error {{found in multiple base classes}}
int &z = c.z(0);
}
namespace example3 {
struct A { static int f(); };
struct B : virtual A { using A::f; };
struct C : virtual A { using A::f; };
struct D : B, C {} d;
int k = d.f();
}
namespace example4 {
struct A { int n; }; // expected-note {{found}}
struct B : A {};
struct C : A {};
struct D : B, C { int f() { return n; } }; // expected-error {{found in multiple base-class}}
}
namespace PR5916 {
// FIXME: This is valid.
struct A { int n; }; // expected-note +{{found}}
struct B : A {};
struct C : A {};
struct D : B, C {};
int k = sizeof(D::n); // expected-error {{found in multiple base}} expected-error {{unknown type name}}
#if __cplusplus >= 201103L
decltype(D::n) n; // expected-error {{found in multiple base}}
#endif
}
}
// dr40: na
namespace dr41 { // dr41: yes
struct S f(S);
}
namespace dr42 { // dr42: yes
struct A { static const int k = 0; };
struct B : A { static const int k = A::k; };
}
// dr43: na
namespace dr44 { // dr44: sup 727
struct A {
template<int> void f();
template<> void f<0>();
};
}
namespace dr45 { // dr45: yes
class A {
class B {};
class C : B {};
C c;
};
}
namespace dr46 { // dr46: yes
template<typename> struct A { template<typename> struct B {}; };
template template struct A<int>::B<int>; // expected-error {{expected unqualified-id}}
}
namespace dr47 { // dr47: sup 329
template<typename T> struct A {
friend void f() { T t; } // expected-error {{redefinition}} expected-note {{previous}}
};
A<int> a;
A<float> b; // expected-note {{instantiation of}}
void f();
void g() { f(); }
}
namespace dr48 { // dr48: yes
namespace {
struct S {
static const int m = 0;
static const int n = 0;
static const int o = 0;
};
}
int a = S::m;
// FIXME: We should produce a 'has internal linkage but is not defined'
// diagnostic for 'S::n'.
const int &b = S::n;
const int S::o;
const int &c = S::o;
}
namespace dr49 { // dr49: yes
template<int*> struct A {}; // expected-note 0-2{{here}}
int k;
#if __has_feature(cxx_constexpr)
constexpr
#endif
int *const p = &k; // expected-note 0-2{{here}}
A<&k> a;
A<p> b;
#if __cplusplus <= 201402L
// expected-error@-2 {{must have its address taken}}
#endif
#if __cplusplus < 201103L
// expected-error@-5 {{internal linkage}}
#endif
int *q = &k;
A<q> c;
#if __cplusplus < 201103L
// expected-error@-2 {{must have its address taken}}
#else
// expected-error@-4 {{constant expression}}
// expected-note@-5 {{read of non-constexpr}}
// expected-note@-7 {{declared here}}
#endif
}
namespace dr50 { // dr50: yes
struct X; // expected-note {{forward}}
extern X *p;
X *q = (X*)p;
X *r = static_cast<X*>(p);
X *s = const_cast<X*>(p);
X *t = reinterpret_cast<X*>(p);
X *u = dynamic_cast<X*>(p); // expected-error {{incomplete}}
}
namespace dr51 { // dr51: yes
struct A {};
struct B : A {};
struct S {
operator A&();
operator B&();
} s;
A &a = s;
}
namespace dr52 { // dr52: yes
struct A { int n; }; // expected-note {{here}}
struct B : private A {} b; // expected-note 2{{private}}
// FIXME: This first diagnostic is very strangely worded, and seems to be bogus.
int k = b.A::n; // expected-error {{'A' is a private member of 'dr52::A'}}
// expected-error@-1 {{cannot cast 'struct B' to its private base}}
}
namespace dr53 { // dr53: yes
int n = 0;
enum E { e } x = static_cast<E>(n);
}
namespace dr54 { // dr54: yes
struct A { int a; } a;
struct V { int v; } v;
struct B : private A, virtual V { int b; } b; // expected-note 6{{private here}}
A &sab = static_cast<A&>(b); // expected-error {{private base}}
A *spab = static_cast<A*>(&b); // expected-error {{private base}}
int A::*smab = static_cast<int A::*>(&B::b); // expected-error {{private base}}
B &sba = static_cast<B&>(a); // expected-error {{private base}}
B *spba = static_cast<B*>(&a); // expected-error {{private base}}
int B::*smba = static_cast<int B::*>(&A::a); // expected-error {{private base}}
V &svb = static_cast<V&>(b);
V *spvb = static_cast<V*>(&b);
int V::*smvb = static_cast<int V::*>(&B::b); // expected-error {{virtual base}}
B &sbv = static_cast<B&>(v); // expected-error {{virtual base}}
B *spbv = static_cast<B*>(&v); // expected-error {{virtual base}}
int B::*smbv = static_cast<int B::*>(&V::v); // expected-error {{virtual base}}
A &cab = (A&)(b);
A *cpab = (A*)(&b);
int A::*cmab = (int A::*)(&B::b);
B &cba = (B&)(a);
B *cpba = (B*)(&a);
int B::*cmba = (int B::*)(&A::a);
V &cvb = (V&)(b);
V *cpvb = (V*)(&b);
int V::*cmvb = (int V::*)(&B::b); // expected-error {{virtual base}}
B &cbv = (B&)(v); // expected-error {{virtual base}}
B *cpbv = (B*)(&v); // expected-error {{virtual base}}
int B::*cmbv = (int B::*)(&V::v); // expected-error {{virtual base}}
}
namespace dr55 { // dr55: yes
enum E { e = 5 };
int test[(e + 1 == 6) ? 1 : -1];
}
namespace dr56 { // dr56: yes
struct A {
typedef int T; // expected-note {{previous}}
typedef int T; // expected-error {{redefinition}}
};
struct B {
struct X;
typedef X X; // expected-note {{previous}}
typedef X X; // expected-error {{redefinition}}
};
}
namespace dr58 { // dr58: yes
// FIXME: Ideally, we should have a CodeGen test for this.
#if __cplusplus >= 201103L
enum E1 { E1_0 = 0, E1_1 = 1 };
enum E2 { E2_0 = 0, E2_m1 = -1 };
struct X { E1 e1 : 1; E2 e2 : 1; };
static_assert(X{E1_1, E2_m1}.e1 == 1, "");
static_assert(X{E1_1, E2_m1}.e2 == -1, "");
#endif
}
namespace dr59 { // dr59: yes
template<typename T> struct convert_to { operator T() const; };
struct A {}; // expected-note 5+{{candidate}}
struct B : A {}; // expected-note 0+{{candidate}}
A a1 = convert_to<A>();
A a2 = convert_to<A&>();
A a3 = convert_to<const A>();
A a4 = convert_to<const volatile A>();
#if __cplusplus <= 201402L
// expected-error@-2 {{no viable}}
#endif
A a5 = convert_to<const volatile A&>(); // expected-error {{no viable}}
B b1 = convert_to<B>();
B b2 = convert_to<B&>();
B b3 = convert_to<const B>();
B b4 = convert_to<const volatile B>();
#if __cplusplus <= 201402L
// expected-error@-2 {{no viable}}
#endif
B b5 = convert_to<const volatile B&>(); // expected-error {{no viable}}
A c1 = convert_to<B>();
A c2 = convert_to<B&>();
A c3 = convert_to<const B>();
A c4 = convert_to<const volatile B>(); // expected-error {{no viable}}
A c5 = convert_to<const volatile B&>(); // expected-error {{no viable}}
int n1 = convert_to<int>();
int n2 = convert_to<int&>();
int n3 = convert_to<const int>();
int n4 = convert_to<const volatile int>();
int n5 = convert_to<const volatile int&>();
}
namespace dr60 { // dr60: yes
void f(int &);
int &f(...);
const int k = 0;
int &n = f(k);
}
namespace dr61 { // dr61: yes
struct X {
static void f();
} x;
struct Y {
static void f();
static void f(int);
} y;
// This is (presumably) valid, because x.f does not refer to an overloaded
// function name.
void (*p)() = &x.f;
void (*q)() = &y.f; // expected-error {{cannot create a non-constant pointer to member function}}
void (*r)() = y.f; // expected-error {{cannot create a non-constant pointer to member function}}
}
namespace dr62 { // dr62: yes
struct A {
struct { int n; } b;
};
template<typename T> struct X {};
template<typename T> T get() { return get<T>(); }
template<typename T> int take(T) { return 0; }
X<A> x1;
A a = get<A>();
typedef struct { } *NoNameForLinkagePtr;
#if __cplusplus < 201103L
// expected-note@-2 5{{here}}
#endif
NoNameForLinkagePtr noNameForLinkagePtr;
struct Danger {
NoNameForLinkagePtr p;
};
X<NoNameForLinkagePtr> x2;
X<const NoNameForLinkagePtr> x3;
NoNameForLinkagePtr p1 = get<NoNameForLinkagePtr>();
NoNameForLinkagePtr p2 = get<const NoNameForLinkagePtr>();
int n1 = take(noNameForLinkagePtr);
#if __cplusplus < 201103L
// expected-error@-6 {{uses unnamed type}}
// expected-error@-6 {{uses unnamed type}}
// expected-error@-6 {{uses unnamed type}}
// expected-error@-6 {{uses unnamed type}}
// expected-error@-6 {{uses unnamed type}}
#endif
X<Danger> x4;
void f() {
struct NoLinkage {};
X<NoLinkage> a;
X<const NoLinkage> b;
get<NoLinkage>();
get<const NoLinkage>();
X<void (*)(NoLinkage A::*)> c;
X<int NoLinkage::*> d;
#if __cplusplus < 201103L
// expected-error@-7 {{uses local type}}
// expected-error@-7 {{uses local type}}
// expected-error@-7 {{uses local type}}
// expected-error@-7 {{uses local type}}
// expected-error@-7 {{uses local type}}
// expected-error@-7 {{uses local type}}
#endif
}
}
namespace dr63 { // dr63: yes
template<typename T> struct S { typename T::error e; };
extern S<int> *p;
void *q = p;
}
namespace dr64 { // dr64: yes
template<class T> void f(T);
template<class T> void f(T*);
template<> void f(int*);
template<> void f<int>(int*);
template<> void f(int);
}
// dr65: na
namespace dr66 { // dr66: no
namespace X {
int f(int n); // expected-note 2{{candidate}}
}
using X::f;
namespace X {
int f(int n = 0);
int f(int, int);
}
// FIXME: The first two calls here should be accepted.
int a = f(); // expected-error {{no matching function}}
int b = f(1);
int c = f(1, 2); // expected-error {{no matching function}}
}
// dr67: na
namespace dr68 { // dr68: yes
template<typename T> struct X {};
struct ::dr68::X<int> x1;
struct ::dr68::template X<int> x2;
#if __cplusplus < 201103L
// expected-error@-2 {{'template' keyword outside of a template}}
#endif
struct Y {
friend struct X<int>;
friend struct ::dr68::X<char>;
friend struct ::dr68::template X<double>;
#if __cplusplus < 201103L
// expected-error@-2 {{'template' keyword outside of a template}}
#endif
};
template<typename>
struct Z {
friend struct ::dr68::template X<double>;
friend typename ::dr68::X<double>;
#if __cplusplus < 201103L
// expected-error@-2 {{C++11 extension}}
#endif
};
}
namespace dr69 { // dr69: yes
template<typename T> static void f() {}
// FIXME: Should we warn here?
inline void g() { f<int>(); }
// FIXME: This should be rejected, per [temp.explicit]p11.
extern template void f<char>();
#if __cplusplus < 201103L
// expected-error@-2 {{C++11 extension}}
#endif
template<void(*)()> struct Q {};
Q<&f<int> > q;
#if __cplusplus < 201103L
// expected-error@-2 {{internal linkage}} expected-note@-11 {{here}}
#endif
}
namespace dr70 { // dr70: yes
template<int> struct A {};
template<int I, int J> int f(int (&)[I + J], A<I>, A<J>);
int arr[7];
int k = f(arr, A<3>(), A<4>());
}
// dr71: na
// dr72: dup 69
#if __cplusplus >= 201103L
namespace dr73 { // dr73: no
// The resolution to dr73 is unworkable. Consider:
int a, b;
static_assert(&a + 1 != &b, ""); // expected-error {{not an integral constant expression}}
}
#endif
namespace dr74 { // dr74: yes
enum E { k = 5 };
int (*p)[k] = new int[k][k];
}
namespace dr75 { // dr75: yes
struct S {
static int n = 0; // expected-error {{non-const}}
};
}
namespace dr76 { // dr76: yes
const volatile int n = 1;
int arr[n]; // expected-error +{{variable length array}}
}
namespace dr77 { // dr77: yes
struct A {
struct B {};
friend struct B;
};
}
namespace dr78 { // dr78: sup ????
// Under DR78, this is valid, because 'k' has static storage duration, so is
// zero-initialized.
const int k; // expected-error {{default initialization of an object of const}}
}
// dr79: na
namespace dr80 { // dr80: yes
struct A {
int A;
};
struct B {
static int B; // expected-error {{same name as its class}}
};
struct C {
int C; // expected-error {{same name as its class}}
C();
};
struct D {
D();
int D; // expected-error {{same name as its class}}
};
}
// dr81: na
// dr82: dup 48
namespace dr83 { // dr83: yes
int &f(const char*);
char &f(char *);
int &k = f("foo");
}
namespace dr84 { // dr84: yes
struct B;
struct A { operator B() const; };
struct C {};
struct B {
B(B&); // expected-note 0-1{{candidate}}
B(C); // expected-note 0-1{{no known conversion from 'dr84::B' to 'dr84::C'}}
operator C() const;
};
A a;
// Cannot use B(C) / operator C() pair to construct the B from the B temporary
// here. In C++17, we initialize the B object directly using 'A::operator B()'.
B b = a;
#if __cplusplus <= 201402L
// expected-error@-2 {{no viable}}
#endif
}
namespace dr85 { // dr85: yes
struct A {
struct B;
struct B {}; // expected-note{{previous declaration is here}}
struct B; // expected-error{{class member cannot be redeclared}}
union U;
union U {}; // expected-note{{previous declaration is here}}
union U; // expected-error{{class member cannot be redeclared}}
#if __cplusplus >= 201103L
enum E1 : int;
enum E1 : int { e1 }; // expected-note{{previous declaration is here}}
enum E1 : int; // expected-error{{class member cannot be redeclared}}
enum class E2;
enum class E2 { e2 }; // expected-note{{previous declaration is here}}
enum class E2; // expected-error{{class member cannot be redeclared}}
#endif
};
template <typename T>
struct C {
struct B {}; // expected-note{{previous declaration is here}}
struct B; // expected-error{{class member cannot be redeclared}}
};
}
// dr86: dup 446
namespace dr87 { // dr87: no
// FIXME: Superseded by dr1975
template<typename T> struct X {};
// FIXME: This is invalid.
X<void() throw()> x;
// This is valid under dr87 but not under dr1975.
X<void(void() throw())> y;
}
namespace dr88 { // dr88: yes
template<typename T> struct S {
static const int a = 1; // expected-note {{previous}}
static const int b;
};
template<> const int S<int>::a = 4; // expected-error {{already has an initializer}}
template<> const int S<int>::b = 4;
}
// dr89: na
namespace dr90 { // dr90: yes
struct A {
template<typename T> friend void dr90_f(T);
};
struct B : A {
template<typename T> friend void dr90_g(T);
struct C {};
union D {};
};
struct E : B {};
struct F : B::C {};
void test() {
dr90_f(A());
dr90_f(B());
dr90_f(B::C()); // expected-error {{undeclared identifier}}
dr90_f(B::D()); // expected-error {{undeclared identifier}}
dr90_f(E());
dr90_f(F()); // expected-error {{undeclared identifier}}
dr90_g(A()); // expected-error {{undeclared identifier}}
dr90_g(B());
dr90_g(B::C());
dr90_g(B::D());
dr90_g(E());
dr90_g(F()); // expected-error {{undeclared identifier}}
}
}
namespace dr91 { // dr91: yes
union U { friend int f(U); };
int k = f(U());
}
namespace dr92 { // dr92: 4 c++17
void f() throw(int, float); // expected-error 0-1{{ISO C++17 does not allow}} expected-note 0-1{{use 'noexcept}}
void (*p)() throw(int) = &f; // expected-error 0-1{{ISO C++17 does not allow}} expected-note 0-1{{use 'noexcept}}
#if __cplusplus <= 201402L
// expected-error@-2 {{target exception specification is not superset of source}}
#else
// expected-warning@-4 {{target exception specification is not superset of source}}
#endif
void (*q)() throw(int); // expected-error 0-1{{ISO C++17 does not allow}} expected-note 0-1{{use 'noexcept}}
void (**pp)() throw() = &q;
#if __cplusplus <= 201402L
// expected-error@-2 {{exception specifications are not allowed}}
#else
// expected-error@-4 {{cannot initialize}}
#endif
void g(void() throw()); // expected-note 0-2 {{no known conversion}} expected-warning 0-1{{mangled name of 'g' will change in C++17}}
void h() throw() {
g(f); // expected-error-re {{{{is not superset|no matching function}}}}
g(q); // expected-error-re {{{{is not superset|no matching function}}}}
}
// Prior to C++17, this is OK because the exception specification is not
// considered in this context. In C++17, we *do* perform an implicit
// conversion (which performs initialization), and the exception specification
// is part of the type of the parameter, so this is invalid.
template<void() throw()> struct X {};
X<&f> xp;
#if __cplusplus > 201402L
// expected-error@-2 {{not implicitly convertible}}
#endif
template<void() throw(int)> struct Y {}; // expected-error 0-1{{ISO C++17 does not allow}} expected-note 0-1{{use 'noexcept}}
Y<&h> yp; // ok
}
// dr93: na
namespace dr94 { // dr94: yes
struct A { static const int n = 5; };
int arr[A::n];
}
namespace dr95 { // dr95: yes
struct A;
struct B;
namespace N {
class C {
friend struct A;
friend struct B;
static void f(); // expected-note {{here}}
};
struct A *p; // dr95::A, not dr95::N::A.
}
A *q = N::p; // ok, same type
struct B { void f() { N::C::f(); } }; // expected-error {{private}}
}
namespace dr96 { // dr96: no
struct A {
void f(int);
template<typename T> int f(T);
template<typename T> struct S {};
} a;
template<template<typename> class X> struct B {};
template<typename T>
void test() {
int k1 = a.template f<int>(0);
// FIXME: This is ill-formed, because 'f' is not a template-id and does not
// name a class template.
// FIXME: What about alias templates?
int k2 = a.template f(1);
A::template S<int> s;
B<A::template S> b;
}
}
namespace dr97 { // dr97: yes
struct A {
static const int a = false;
static const int b = !a;
};
}
namespace dr98 { // dr98: yes
void test(int n) {
switch (n) {
try { // expected-note 2{{bypasses}}
case 0: // expected-error {{cannot jump}}
x:
throw n;
} catch (...) { // expected-note 2{{bypasses}}
case 1: // expected-error {{cannot jump}}
y:
throw n;
}
case 2:
goto x; // expected-error {{cannot jump}}
case 3:
goto y; // expected-error {{cannot jump}}
}
}
}
namespace dr99 { // dr99: sup 214
template<typename T> void f(T&);
template<typename T> int &f(const T&);
const int n = 0;
int &r = f(n);
}